Santiago Bejarano refactored the juanfcarrillo/servicios-ciudadanos backend, focusing on modularizing Django models to enforce the Single Responsibility Principle. He separated models into individual files, updated imports, and replaced repetitive conditional logic with descriptive Python methods, resulting in a more maintainable and readable codebase. By verifying behavioral parity with Behave BDD tests, Santiago ensured that the refactor preserved existing functionality. His work reduced technical debt and improved testability, laying a foundation for faster feature development. This targeted refactor demonstrated strong backend development and code organization skills, with a clear emphasis on maintainability and adherence to best practices in Python and Django.